Using Application Isolation

In the scenario illustrated in the following figure a bug in Application
1 causes Directory Server to fail. The proxy configuration ensures that
LDAP requests from Application 1 are only ever sent to Master 1 and to Master
3. When the bug occurs, Masters 1 and 3 fail. However, Applications 2, 3,
and 4 are not disabled, because they can still reach a functioning Directory Server.